Note 15 - Taxes on Income - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss before income tax benefit	$ (2,750)	$ (3,825)	$ (3,095)
Theoretical tax benefit at U.S. statutory tax rate (21% for 2019 and 2018 and 35% for 2017)	(578)	(803)	(1,083)
State taxes, net of federal benefit	2	3	2
Foreign income taxed at rates other than the U.S. rate (including deferred taxes that were not provided, valuation allowance and current adjustment and interest on uncertain tax position liability)	(1,761)	(1,767)	(808)
Nondeductible equity-based compensation expenses	604	542	816
Valuation allowance in U.S.	173	157	984
Other			(2)
	$ (1,560)	$ (1,868)	$ (92)